refactor SvxShowText to use RenderContext
refactor SvxShowText to use RenderContext

Change-Id: I7e059c36bb5a130f823a6da5feb981b0926b3294

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core